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Unconditional creature destruction has always sat behind a black tax: Murder wants two colored pips, Hero's Downfall and its kin ask for real mana on the turn you want to cast them. Convoke reroutes that cost through the board instead of the manabase. A single black source plus three creatures tapped from a wide board, and the kill fires at what amounts to one real mana out of your pool. Notice which deck can actually pay that way: the spell wants exactly what a creature deck already has lying around, bodies, and a reason not to send all of them into combat. That makes this less a control tool than an aggro-and-midrange one, where the tapped creatures were going to sit idle for a phase anyway and the black pip is the only hard requirement. Because it is a sorcery, the payment structure works cleanest in your first main phase, before combat: convoke the removal with the creatures you plan to hold back, clear the blocker standing between your board and the red zone, then swing with the rest. The nominal rate, a four-mana kill spell, is a red herring; the payment model is the whole design, and it prices unconditional removal in creatures rather than lands for a deck that would rather spend the former. What the card asks is not "do you have four mana" but "do you have a board you can afford to tap down."